Combustion chamber smoke dilution sampling test equipment

Abstract

The invention provides combustion chamber smoke diluting, sampling and testing equipment which comprises a smoke collecting mechanism arranged on one side of a combustor and used for collecting smoke in the combustor; the air generating mechanism is used for providing clean air; the venturi mixer is communicated with the flue gas collecting mechanism and the air generating mechanism and is used for mixing the flue gas and the air; the staying mechanism is communicated with the Venturi mixer and is used for staying the mixed flue gas and air for a period of time; and the sampling mechanism is communicated with the staying mechanism and is used for sampling the mixed flue gas which stays stably. The combustion chamber smoke dilution sampling test equipment does not need to pay attention to the influence of various parameters of smoke on a sampling instrument, so that the test path is simplified; the real change process of the high-temperature flue gas entering the atmospheric environment is simulated, and the comprehensive characteristic is realized.

Description

Technical Field

[0001] The invention relates to the technical field of smoke sampling, and in particular to a combustion chamber smoke dilution sampling test device. Background Art

[0002] Combustion is a violent chemical reaction between fuel and oxidant, which is not only accompanied by light and heat, but also a key area of ​​research in engineering thermophysics. In this reaction process, hydrocarbon compounds, that is, compounds composed of two elements, carbon and hydrogen, are an important source of fuel and are widely used in human life and transportation.

[0003] The complete combustion of hydrocarbon fuels will produce carbon dioxide and water, both of which are relatively environmentally friendly. However, due to the complexity of the combustion process, hydrocarbon fuels often cannot achieve complete combustion, resulting in the generation of pollutants such as soot. Soot is not only an inevitable harmful product of the combustion process, but also causes serious pollution and damage to the environment. In addition, the emission of soot will reduce the combustion efficiency of the fuel and may damage the internal structure of the burner due to deposition, further affecting the stability and service life of the combustion system. Studies have found that the combustion environment has a significant impact on the generation of soot, among which oxygen concentration and environmental pressure are two key factors. By adjusting these parameters, the amount of soot generated can be effectively controlled, thereby achieving high-efficiency combustion and low-pollution emissions of hydrocarbon fuels.

[0004] Therefore, there is an urgent need to develop a device that can be used to study the performance of corresponding parameters during smoking combustion, optimize combustion conditions, and reduce carbon soot generation, which is of great significance for improving combustion efficiency, protecting the environment, and extending the service life of the burner. Summary of the invention

[0005] The invention provides a combustion chamber smoke dilution sampling test device, which is used to detect the corresponding parameter performance during the current smoking combustion.

[0006] The present invention provides a combustion chamber smoke dilution sampling test device, comprising: A smoke collecting mechanism, arranged on one side of the burner, for collecting smoke in the burner; An air generating mechanism for providing clean air; A venturi mixer, connected to the smoke collecting mechanism and the air generating mechanism, for mixing the smoke and air; A retention mechanism, connected to the Venturi mixer, for retaining the mixed flue gas and air for a period of time; The sampling mechanism is connected to the retention mechanism and is used for sampling the mixed flue gas after it has been retained and stabilized.

[0007] According to a combustion chamber smoke dilution sampling test device provided by the present invention, the smoke collection mechanism comprises: A sampling probe is arranged on one side of the burner; A sampling tube, one end of which is connected to the sampling probe, and the other end of which is connected to the Venturi mixer; A heating belt is wound around the sampling tube.

[0008] According to a combustion chamber smoke dilution sampling test device provided by the present invention, the smoke collection mechanism also includes: The first regulating valve is connected between the sampling pipe and the Venturi mixer.

[0009] According to a combustion chamber smoke dilution sampling test device provided by the present invention, the air generating mechanism comprises: an air compressor; The filter has one end connected to the air compressor and the other end connected to the venturi mixer for dust removal, drying and filtering of the air.

[0010] According to a combustion chamber smoke dilution sampling test device provided by the present invention, the air generating mechanism further comprises: a second regulating valve connected between the air compressor and the filter; a first flow meter connected between the filter and the venturi mixer; A first pressure gauge is connected between the filter and the venturi mixer.

[0011] According to a combustion chamber smoke dilution sampling test equipment provided by the present invention, the filter is a three-stage filter, including: a first filter, a second filter and a third filter connected in sequence, the first filter is used to remove dust from the air, the second filter is used to dry the air, and the third filter is used to filter the air.

[0012] According to a combustion chamber smoke dilution sampling test device provided by the present invention, the Venturi mixer is used to form a negative pressure in a narrowed channel to guide smoke to enter and mix with air.

[0013] According to a combustion chamber smoke dilution sampling test device provided by the present invention, the dwelling mechanism comprises: a residence chamber, one end of which is connected to the venturi mixer and the other end of which is connected to the sampling mechanism; a second pressure gauge, connected to the dwelling chamber; A temperature gauge is communicated with the residence chamber.

[0014] According to a combustion chamber smoke dilution sampling test device provided by the present invention, the sampling mechanism comprises: Vacuum pump; a first membrane support and a third regulating valve, wherein the vacuum pump is connected to the sampling mechanism through the first membrane support and the third regulating valve; A second membrane support and a fourth regulating valve, the vacuum pump is connected to the sampling mechanism through the second membrane support and the fourth regulating valve.

[0015] According to a combustion chamber smoke dilution sampling test device provided by the present invention, the sampling mechanism further comprises: a fifth regulating valve connected between the third regulating valve and the stop mechanism, and / or connected between the fourth regulating valve and the stop mechanism; The second flow meter is connected between the vacuum pump and the first membrane support, and / or connected between the vacuum pump and the second membrane support.

[0016] The combustion chamber smoke dilution sampling test equipment provided by the present invention does not need to pay attention to the influence of various parameters of smoke on the sampling instrument, simplifies the test path, simulates the real change process of high-temperature smoke after entering the atmospheric environment, and has the characteristics of comprehensiveness. At the same time, the clean air is provided by the air generating mechanism, and the smoke collected by the smoke collecting mechanism is mixed in the venturi mixer, which effectively avoids the positive deviation of the sampling result caused by the original particulate matter in the air, thereby ensuring the accuracy and reliability of the sampling result. The equipment calculates the dilution ratio by the volume flow rate of the introduced clean air and the volume flow rate of the smoke collected by the sampling probe, ensuring the rationality and accuracy of the dilution ratio. A reasonable dilution ratio helps to reduce the concentration of particulate matter in the smoke, which is convenient for subsequent sampling and analysis. The residence mechanism allows the mixed smoke and air to stay for a period of time, and the length of this period of time is crucial to the smooth generation of primary condensed particulate matter. Reasonable residence time can ensure that the particulate matter is fully condensed in the mixed gas, thereby improving the accuracy and representativeness of the sampling. The overall design of the equipment is miniaturized, easy to carry and transport, making it possible to carry out real-time sampling in outdoor places such as airports. This design not only improves the practicality of the equipment, but also expands its application scenarios and scope. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the combustion chamber smoke dilution sampling test equipment provided by the present invention.

[0019] Reference numerals: 1. Burner; 2. Sampling probe; 3. Sampling tube; 4. Heating belt; 5. Air compressor; 6. Second regulating valve; 7. First filter; 8. Second filter; 9. Third filter; 10. First pressure gauge; 11. First flow meter; 12. First regulating valve; 13. Venturi mixer; 14. Second pressure gauge; 15. Stay chamber; 16. Thermometer; 17. Fifth regulating valve; 18. Third regulating valve; 19. Fourth regulating valve; 20. First membrane support; 21. Second membrane support; 22. Second flow meter; 23. Vacuum pump; 24. Nitrogen bottle; 25. Oil tank; 26. Sixth regulating valve; 27. Third flow meter; 28. Third pressure gauge; 29. ​​Fan; 30. Fourth flow meter; 31. Seventh regulating valve; 32. Nozzle. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Combine the following Figure 1 The combustion chamber smoke dilution sampling test equipment provided by the present invention is described. The combustion chamber smoke dilution sampling test equipment does not need to pay attention to the influence of various parameters of the smoke on the sampling instrument, simplifies the test path, simulates the real change process of high-temperature smoke after entering the atmospheric environment, and has the characteristics of comprehensiveness.

[0022] In this embodiment, the burner 1 is provided with a fan 29, whose main function is to introduce air into the burner 1. Air is an indispensable oxidant in the combustion process. The fan 29 controls the amount of air introduced through the fourth flowmeter 30 and the seventh regulating valve 31, thereby ensuring the stability and controllability of the combustion process. The fourth flowmeter 30 is used to measure the flow rate of the introduced air, and the seventh regulating valve 31 is used to adjust this flow rate. By accurately controlling the flow rate of the introduced air, the combustion process can be optimized and the combustion efficiency and stability can be improved. In addition to air, the burner 1 also introduces and stores fuel oil or other flammable liquids through the nitrogen bottle 24 and the oil tank 25. Nitrogen (or other gas / liquid) enters the oil tank 25 from the nitrogen bottle 24, and the flow rate is measured by the sixth regulating valve 26 and the third flowmeter 27, and the pressure is monitored by the third pressure gauge 28. The nozzle 32 is responsible for spraying the fuel into the combustion area at an appropriate proportion and speed.

[0023] The present application embodiment provides a combustion chamber smoke dilution sampling test device, such as Figure 1As shown, the combustion chamber smoke dilution sampling test equipment includes: a smoke collection mechanism, an air generating mechanism, a venturi mixer 13, a retention mechanism and a sampling mechanism. The smoke collection mechanism is arranged on one side of the burner 1, and is used to collect the smoke in the burner 1; the air generating mechanism is used to provide clean air; the venturi mixer 13 is connected to the smoke collection mechanism and the air generating mechanism, and is used to mix the smoke and air; the retention mechanism is connected to the venturi mixer 13, and is used to retain the mixed smoke and air for a period of time; the sampling mechanism is connected to the retention mechanism, and is used to sample the mixed smoke after retention and stabilization.

[0024] In this embodiment, the smoke collection mechanism is arranged on one side of the burner 1, and its main responsibility is to capture and collect the smoke generated in the burner 1. This step is the key to obtaining the smoke to be tested, ensuring the accuracy and reliability of subsequent analysis. The air generating mechanism is responsible for providing clean, pollution-free air. In the dilution sampling process, clean air is necessary to ensure the accuracy of the test results and avoid the influence of external pollution on the test results. The venturi mixer 13 efficiently mixes the smoke from the smoke collection mechanism and the air from the air generating mechanism. With its unique design, the venturi mixer 13 can achieve uniform mixing of the two gases and provide uniform mixed smoke for subsequent steps. The mixed smoke and air enter the retention mechanism, and the mixed gas stays inside the retention mechanism for a period of time to ensure that the mixing is more sufficient and stable. Finally, the mixed smoke after being stabilized by the retention mechanism is sent to the sampling mechanism. The sampling mechanism is responsible for collecting samples from the mixed gas for subsequent analysis and testing.

[0025] The combustion chamber smoke dilution sampling test equipment provided by the present invention does not need to pay attention to the influence of various parameters of the smoke on the sampling instrument, simplifies the test path, simulates the real change process of high-temperature smoke after entering the atmospheric environment, and has the characteristics of comprehensiveness. At the same time, the clean air is provided by the air generating mechanism, and the smoke collected by the smoke collecting mechanism is mixed in the venturi mixer 13, which effectively avoids the positive deviation of the sampling result caused by the original particulate matter in the air, thereby ensuring the accuracy and reliability of the sampling result. The equipment calculates the dilution ratio by the volume flow rate of the introduced clean air and the volume flow rate of the smoke collected by the sampling probe 2, ensuring the rationality and accuracy of the dilution ratio. A reasonable dilution ratio helps to reduce the concentration of particulate matter in the smoke, which is convenient for subsequent sampling and analysis. The residence mechanism allows the mixed smoke and air to stay for a period of time, and the length of this period of time is crucial to the smooth generation of primary condensed particulate matter. Reasonable residence time can ensure that the particulate matter is fully condensed in the mixed gas, thereby improving the accuracy and representativeness of the sampling. The overall design of the equipment is miniaturized, easy to carry and transport, making it possible to carry out real-time sampling in outdoor places such as airports. This design not only improves the practicality of the equipment, but also expands its application scenarios and scope.

[0026] It should be noted that, except for the air generating mechanism retention chamber 15, the remaining mechanisms can be placed on a movable platform with wheels at the bottom, so as to be easily moved to different sampling locations, such as indoor test bench component test sites, outdoor airborne sites, etc.

[0027] In some embodiments, Figure 1 As shown, the flue gas collection mechanism includes: a sampling probe 2, a sampling tube 3 and a heating belt 4. The sampling probe 2 is arranged on one side of the burner 1. One end of the sampling tube 3 is connected to the sampling probe 2, and the other end is connected to the venturi mixer 13; the heating belt 4 is wound around the sampling tube 3.

[0028] Among them, the sampling probe 2 is arranged on one side of the burner 1 to directly capture the flue gas generated by combustion. Its position should ensure that it can accurately reflect the flue gas characteristics at the outlet of the burner 1. Generally, the sampling probe 2 should be placed at the outlet of the burner 1, and the distance should not be greater than 0.5 outlet diameters. Such a position selection ensures that the sampling probe 2 can capture the most representative flue gas sample. A stainless steel sampling probe 2 can be used. The stainless steel sampling probe 2 is ordinary 304 steel and is suitable for normal pressure burners 1. If used on a high-pressure test bench, the high-temperature resistant stainless steel material can be replaced to ensure the stability and durability of the sampling probe 2.

[0029] The sampling tube 3 is made of stainless steel, and the inner wall is smooth to reduce the loss and deposition of flue gas during transmission. The inner diameter is 8mm and the length is 1m. This design not only ensures sufficient sampling volume, but also facilitates installation and operation. The entrance of the sampling tube 3 is designed as a right-angle bend, facing the center line of the flue to ensure that the collected flue gas is representative. The heating belt 4 is wrapped around the outer wall of the sampling tube 3, and the temperature is maintained at about 120°C by the temperature control device. The use of the heating belt 4 can prevent the flue gas from condensing in the sampling tube 3, thereby maintaining the original state of the flue gas and improving the accuracy of the test. The heating belt 4 is 30mm wide, the outer material is glass fiber, the heating material is nickel-chromium alloy electric heating wire, and the heat-resistant temperature is 450°C. These parameters ensure the stability and durability of the heating belt 4. The polytetrafluoroethylene hose is connected to the other end of the sampling tube 3, which is used to remove the stainless steel sampling tube 3 before the test and replace it with a float flowmeter to calibrate the flue gas flow. PTFE hose has excellent corrosion resistance and chemical stability, with an operating temperature of -190℃250℃ and an operating pressure of -0.16.4Mpa. These characteristics make it an ideal choice for flue gas flow calibration.

[0030] In this embodiment, the smoke collection mechanism further includes: a first regulating valve 12. The first regulating valve 12 is connected between the sampling pipe 3 and the venturi mixer 13, and is used to adjust the smoke flow entering the mixer.

[0031] Since the particles from burning jet fuel are generally smaller than 1000nm and the Stokes number is less than 0.01, the smoke collection agency did not consider whether to perform isokinetic sampling. This decision was based on the size of the Stokes number, ensuring the rationality and accuracy of the sampling process.

[0032] Before the test begins, turn on the thermostat to preheat the sampling tube 3, setting the maximum temperature to 120° C. and the minimum temperature to 110° C. The preheating process ensures that the sampling tube 3 maintains a constant temperature during the test to prevent flue gas condensation.

[0033] In some embodiments, Figure 1 As shown, the air generating mechanism includes: an air compressor 5 and a filter. One end of the filter is connected to the air compressor 5, and the other end is connected to the venturi mixer 13, so as to remove dust, dry and filter the air.

[0034] Specifically, the air compressor 5, as the core component of the air generating mechanism, is responsible for generating continuous high-pressure air. In order to avoid the influence of lubricating oil on air cleanliness from the source, an oil-free dry air compressor 5 is used. The air storage tank has a capacity of 50L. When the pressure reaches 0.8Mpa, the pressure switch automatically closes; when the pressure drops to 0.5Mpa, the pressure switch automatically opens to ensure the continuous supply of air and the stability of pressure. The filter is used to remove dust, dry and filter the air introduced by the air compressor 5.

[0035] The air generating mechanism further includes: a second regulating valve 6, a first flow meter 11 and a first pressure gauge 10. The second regulating valve 6 is connected between the air compressor 5 and the filter; the first flow meter 11 is connected between the filter and the venturi mixer 13; and the first pressure gauge 10 is connected between the filter and the venturi mixer 13.

[0036] The second regulating valve 6 is connected between the air compressor 5 and the filter to adjust the air flow through the filter. By adjusting the second regulating valve 6, the amount of dilution air entering the venturi mixer 13 can be controlled, and the air volume can be adjusted within 60~230L / min to meet the needs of different tests.

[0037] The first flow meter 11 is connected between the filter and the venturi mixer 13, and is used to measure the dilution air flow entering the venturi mixer 13. Through the first flow meter 11, the flow of the dilution air can be monitored and adjusted in real time to ensure the accuracy and stability of the test. The first pressure gauge 10 is also connected between the filter and the venturi mixer 13 to measure the pressure of the filtered air. Through the first pressure gauge 10, the pressure change of the air during the filtration process can be understood to ensure the stability and reliability of the air during the transmission process.

[0038] The dilution air flow and pressure can be precisely controlled and monitored by using the second regulating valve 6, the first flow meter 11 and the first pressure gauge 10. This design allows the air generating mechanism to have greater flexibility in operation and can meet the needs of different tests.

[0039] In some embodiments, Figure 1 As shown, the filter is a three-stage filter, including: a first filter 7, a second filter 8 and a third filter 9 connected in sequence, the first filter 7 is used to remove dust from the air, the second filter 8 is used to dry the air, and the third filter 9 is used to filter the air.

[0040] Specifically, the three-stage filter removes dust, dries and filters the air. The first filter 7 is used for dust removal, with a filtration level of 1m; the second filter 8 is used to dry the air and remove moisture; the third filter 9 is an activated carbon filter element with a filtration level of 0.01m, which filters organic matter in the air to ensure that the diluted air is clean and dust-free. The series use of the three-stage filter greatly improves the cleanliness of the air.

[0041] If the air introduced by the air generating mechanism does not meet the cleanliness requirements, it will directly affect the credibility of the test. Therefore, the cleanliness of the dilution gas must be tested before the test. The specific method is to filter the dilution gas at a filtration flow rate of 100L / min for 20 minutes, and the change in the filter membrane mass does not exceed 0.0002g (200μg) to ensure that the cleanliness of the dilution air meets the test requirements.

[0042] In some embodiments, Figure 1 As shown, the venturi mixer 13 is used to form negative pressure in the narrowed channel to guide the smoke to enter and mix with the air.

[0043] In this embodiment, the main function of the venturi mixer 13 is to form negative pressure in the narrowed channel, thereby guiding the smoke to enter and fully mix with the clean air, and finally delivering the mixed gas to the retention chamber 15. This mixing method can ensure that the smoke and air are fully contacted and dispersed during the mixing process, thereby improving the mixing efficiency and mixing quality.

[0044] The principle of the Venturi mixer 13 is based on the Bernoulli equation of fluid mechanics. When a high-speed airflow flows through a mixer with a narrowing channel, the speed of the airflow increases and the static pressure decreases. At the channel nozzle 32, the flow rate reaches the maximum and the static pressure drops to the minimum, forming a negative pressure area. At this time, the smoke is sucked into the mixer by another channel perpendicular to the air flow direction, collides and shears with the high-speed airflow, thereby achieving the purpose of mixing with the air.

[0045] The Venturi mixer 13 is made of stainless steel, which has good corrosion resistance and high temperature resistance. Its two inlets and one outlet are connected by standard flanges, which is convenient for connection and disassembly with other pipes and equipment. The flue gas end is DN15, and the remaining two ends are DN25. This design can ensure the flow matching and mixing effect of flue gas and air.

[0046] Under the conditions of flue gas flow rate of 10L / min and dilution gas flow rate of 70L / min, the dilution ratio is 7. The inner diameter of the downstream pipeline of the mixing position is 30mm. According to the flow calculation in the fluid pipeline, the Reynolds number at the Venturi outlet is 4450, which meets the turbulence requirement. These performance parameters ensure the stability and reliability of the Venturi mixer 13 in practical applications.

[0047] The entire dilution pipeline of the Venturi mixer 13 is designed to have a total length of 1000 mm, and is made entirely of 304 stainless steel. 304 stainless steel has good corrosion resistance and high temperature resistance, which can ensure the stability and reliability of the dilution pipeline during long-term operation. The left clamp-type vortex flowmeter is used to measure the instantaneous flow rate and cumulative flow rate of the dilution gas. The entire pipeline is connected by flanges, and sealing gaskets are placed between the flanges to ensure sealing. This connection method is easy to assemble and disassemble, and is convenient for the entire device to be transported to different sampling sites.

[0048] In some embodiments, Figure 1 As shown, the dwell mechanism includes: a dwell chamber 15, a second pressure gauge 14 and a temperature gauge 16. One end of the dwell chamber 15 is connected to the venturi mixer 13, and the other end is connected to the sampling mechanism; the second pressure gauge 14 is connected to the dwell chamber 15; and the temperature gauge 16 is connected to the dwell chamber 15.

[0049] Specifically, the retention mechanism includes three main parts: a second pressure gauge 14, a retention chamber 15 (stainless steel barrel) and a temperature gauge 16. These parts work together to ensure that the mixed gas is fully retained and uniformly mixed in the retention chamber 15, while monitoring the pressure and temperature of the mixed gas.

[0050] The residence chamber 15 is a stainless steel barrel with a volume of 88L, a top inlet for the mixed gas, and a side bottom outlet. This design ensures that the mixed gas has sufficient residence time in the residence chamber 15, thereby achieving a better mixing effect. The stainless steel barrel has a wall thickness of 2mm, a diameter of 400mm, and a height of 700mm. These size parameters ensure the strength and stability of the residence chamber 15. The inlet is located at the center of the top of the barrel, and the outlet is located at the bottom side and perpendicular to the barrel wall. This layout is conducive to the uniform distribution and outflow of the mixed gas.

[0051] When the mixed gas flow rate is maintained at 110 L / min, the residence time is 48 s, which can ensure that the mixed gas is fully mixed and reacted in the residence chamber 15, thereby meeting the experimental design requirements.

[0052] The outlet is designed as a three-way, one way flows to the sampling mechanism, and the other way is directly discharged to the outside. This design can flexibly adjust the flow direction of the mixed gas. On the one hand, it can discharge excess smoke. On the other hand, when the sampling is completed, it can be connected to the aluminum gas sampling bag to collect smoke for gas composition analysis.

[0053] The temperature gauge 16 is installed on the side at the same level as the outlet to monitor the temperature of the mixed gas to prevent the temperature from being too high to meet the test design requirements or causing damage to the sampling mechanism. The second pressure gauge 14 is used for pressure detection during sampling. A small amount of air is introduced into the entire system and positive pressure is maintained, and the pressure change of the pressure gauge is recorded to detect the air tightness of the system. The specific method is: keep the system pressure at 2kPa, and the pressure drop within 3 minutes does not exceed 5%, which is considered to be good air tightness.

[0054] In some embodiments, the sampling mechanism includes: a vacuum pump 23, a first membrane support 20, a third regulating valve 18, a second membrane support 21 and a fourth regulating valve 19. The vacuum pump 23 is connected to the sampling mechanism through the first membrane support 20 and the third regulating valve 18, and the vacuum pump 23 is connected to the sampling mechanism through the second membrane support 21 and the fourth regulating valve 19.

[0055] The sampling mechanism further includes: a fifth regulating valve 17 and a second flow meter 22. The fifth regulating valve 17 is connected between the third regulating valve 18 and the stop mechanism, and / or between the fourth regulating valve 19 and the stop mechanism; the second flow meter 22 is connected between the vacuum pump 23 and the first membrane support 20, and / or between the vacuum pump 23 and the second membrane support 21.

[0056] Specifically, the sampling mechanism includes components such as a vacuum pump 23, a first membrane support 20, a third regulating valve 18, a second membrane support 21, a fourth regulating valve 19, a fifth regulating valve 17 and a second flow meter 22. These components work together to achieve stable sampling and precise control of flue gas.

[0057] The sampling mechanism adopts a branch design, the purpose of which is to introduce smoke through the branch (the second membrane support 21 and the fourth regulating valve 19) before sampling, and then open the main path (the first membrane support 20 and the third regulating valve 18) and close the branch after the flow is stable, so as to ensure the accuracy and stability of sampling. This design can avoid errors caused by unstable flow at the beginning of sampling.

[0058] The first membrane holder 20 and the second membrane holder 21 are made of stainless steel and are bolted to facilitate the replacement of the filter membrane during multiple measurements. The two membrane holders are arranged in parallel and vertically, which is conducive to the uniform passage of the sampled gas through the membrane holder and avoids the influence of gravity sedimentation on the sampling. The filter membrane is selected as Whatman 47mm quartz filter membrane, which has extremely low heavy metal and alkaline earth metal content, is resistant to acidic gas and high temperature environment, and has a retention efficiency of more than 99.995% for particles larger than 0.3μm. The filter membrane needs to be pre-treated before the test to remove organic matter on the filter membrane.

[0059] The vacuum pump 23 is an oil-free piston type with a suction speed of 6~58L / min, which can meet the needs of different sampling flow rates. The second flow meter 22 is a float flow meter, which is arranged between the vacuum pump 23 and the main road (branch road) for precise flow control, and the flow rate is controlled at 30L / min. The fifth regulating valve 17 is connected between the third regulating valve 18 and the retention mechanism, or between the fourth regulating valve 19 and the retention mechanism, and is used to adjust the flue gas flow entering the sampling mechanism. The third regulating valve 18 and the fourth regulating valve 19 are used to control the flue gas flow through the first membrane support 20 and the second membrane support 21, respectively.

[0060] The connecting pipes of the entire sampling mechanism are made of polytetrafluoroethylene hoses that are resistant to smoke corrosion and high temperature. This material has good corrosion resistance and high temperature resistance, which can ensure the stability and reliability of the sampling mechanism.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A combustion chamber smoke dilution sampling test equipment, characterized in that: include: A smoke collecting mechanism, arranged on one side of the burner, for collecting smoke in the burner; An air generating mechanism for providing clean air; A venturi mixer, connected to the smoke collecting mechanism and the air generating mechanism, for mixing the smoke and air; A retention mechanism, connected to the Venturi mixer, for retaining the mixed flue gas and air for a period of time; The sampling mechanism is connected to the retention mechanism and is used for sampling the mixed flue gas after it has been retained and stabilized.

2. The combustion chamber smoke dilution sampling test equipment according to claim 1, characterized in that: The smoke collection mechanism comprises: A sampling probe is arranged on one side of the burner; A sampling tube, one end of which is connected to the sampling probe, and the other end of which is connected to the Venturi mixer; A heating belt is wound around the outside of the sampling tube.

3. The combustion chamber smoke dilution sampling test equipment according to claim 2, characterized in that: The smoke collection mechanism also includes: The first regulating valve is connected between the sampling pipe and the Venturi mixer.

4. The combustion chamber smoke dilution sampling test equipment according to claim 1, characterized in that: The air generating mechanism comprises: Air compressor; The filter has one end connected to the air compressor and the other end connected to the venturi mixer for dust removal, drying and filtering of the air.

5. The combustion chamber smoke dilution sampling test equipment according to claim 4, characterized in that: The air generating mechanism also includes: a second regulating valve connected between the air compressor and the filter; a first flow meter connected between the filter and the venturi mixer; A first pressure gauge is connected between the filter and the venturi mixer.

6. The combustion chamber smoke dilution sampling test equipment according to claim 4, characterized in that: The filter is a three-stage filter, including: a first filter, a second filter and a third filter connected in sequence, the first filter is used to remove dust from the air, the second filter is used to dry the air, and the third filter is used to filter the air.

7. The combustion chamber smoke dilution sampling test equipment according to claim 1, characterized in that: The Venturi mixer is used to form negative pressure in a narrow passage, and guide smoke to enter to mix with air.

8. The combustion chamber smoke dilution sampling test equipment according to claim 1, characterized in that: The stay facilities include: a residence chamber, one end of which is connected to the venturi mixer and the other end of which is connected to the sampling mechanism; a second pressure gauge, connected to the dwelling chamber; A temperature gauge is communicated with the residence chamber.

9. The combustion chamber smoke dilution sampling test equipment according to claim 1, characterized in that: The sampling mechanism comprises: Vacuum pump; a first membrane support and a third regulating valve, wherein the vacuum pump is connected to the sampling mechanism through the first membrane support and the third regulating valve; A second membrane support and a fourth regulating valve, the vacuum pump is connected to the sampling mechanism through the second membrane support and the fourth regulating valve.

10. The combustion chamber smoke dilution sampling test equipment according to claim 8, characterized in that: The sampling mechanism also includes: a fifth regulating valve connected between the third regulating valve and the stop mechanism, and / or connected between the fourth regulating valve and the stop mechanism; The second flow meter is connected between the vacuum pump and the first membrane support, and / or connected between the vacuum pump and the second membrane support.

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